WO1996018874A1 - Systeme de conduites, en particulier pour le transport de chaleur dans le chauffage a distance - Google Patents
Systeme de conduites, en particulier pour le transport de chaleur dans le chauffage a distance Download PDFInfo
- Publication number
- WO1996018874A1 WO1996018874A1 PCT/EP1995/004616 EP9504616W WO9618874A1 WO 1996018874 A1 WO1996018874 A1 WO 1996018874A1 EP 9504616 W EP9504616 W EP 9504616W WO 9618874 A1 WO9618874 A1 WO 9618874A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- line
- location
- pipe system
- resistance
- sensor line
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
- G01M3/165—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means by means of cables or similar elongated devices, e.g. tapes
Definitions
- Piping systems for the transmission of district heating or other liquid media are known. They usually contain an inner pipe that carries the medium, an outer pipe surrounding the inner pipe at a distance, and filler material in the space between the two pipes for thermal insulation. The filling material is there
- a conductor consists of nickel chromium (NiCr) and is relatively high-resistance at 5.6 ohms / meter, so it has a high specific resistance.
- the location of the leak is carried out according to the resistance measurement method by the ohmic resistance between this NiCr conductor and a mederohmigen second conductor, conductive pipe or earth measured and the location of the fault location is determined according to the principle of the unloaded voltage divider.
- This method is advantageous for construction supervision, enables precise, early location and preferably indicates the source of the error. This known method is abbreviated below
- the leak is located by measuring the transit time of a pulse that occurs at the
- the two measurement methods described are based on different principles.
- the first measuring method is more suitable for less moist fault controllers and has a limit of use in the direction of very damp fault points.
- the second measuring method is particularly suitable for very moist defects and has a limit of use towards less moist defects. So far, both measuring methods have been used alternatively, depending on the user's requirements.
- the sensors for the two measuring methods have to meet almost opposite conditions, namely one with low resistance and one with high resistance.
- a piping system is known (DE 41 24 640 A1) with which the advantages of both measuring methods can be combined.
- This piping system contains three conductors of different resistances and therefore piping materials.
- NiCr is used for one conductor and the other two conductors bare copper or insulated copper. There is still no agreement on this system.
- Runtime location can be useful, it is almost unsuitable for resistance location. But this measuring technique offers
- the invention has for its object a pipe system with sensors from electrical lines in the space between
- the invention consists in that an alloy is used as the material of the sensor line, which has such a low temperature coefficient (TK), which has a largely constant temperature coefficient (TK), and which has a resistance which is so small on the one hand that the runtime location can be carried out with the line and, on the other hand, is so large that the resistance location can be carried out.
- TK low temperature coefficient
- TK largely constant temperature coefficient
- the design is selected so that transition resistances (R ⁇ ) have no influence. This is the case if R ⁇ ⁇ R sensor , based on a length of eg 10cm.
- the invention is based on the knowledge that conductors with a comparatively low resistance value can then be used for the resistance detection if this conductor has a small and largely constant temperature coefficient. In a practical example, this is
- Material of the sensor conductor is a copper-nickel alloy.
- the conductor cross section was 1.0 mm 2 .
- the resistance value for this conductor (CuNi10) was 0.15 Ohm per meter, i.e. about one
- Resistance wire NiCr 8020 The temperature coefficient for this alloy is about 4x as large as for the resistance wire NiCr 8020 previously used for resistance detection, but is only a tenth of the value previously used for the
- Runtime location used copper lines For the location of the resistance, this sensor conductor is preferably provided with perforated insulation, because this increases the resolution of the measured values. In the limit case, a bare sensor conductor can also be used.
- the second wire, the return wire can consist of an insulated copper wire.
- a return wire with a cross-section that is larger than that of the sensor line, for example 2.5 mm 2 has proven useful for solving the task of creating a system for both location methods. As a result, a favorable resistance proportion of the sensor to the return wire is achieved with respect to the location of the resistance, without assigning the sensor conductor a larger resistance that is desired per se.
- the embodiment described so far can work with good results in terms of resistance location with line lengths of 1000 m.
- runtime location it can be used for monitoring for any length.
- localization is possible for the range from 1000 to 300 meters and fine localization is possible for the range from 300 to 0 meters.
- Fine localization with runtime localization was previously also provided for a test point every 250 m.
- the soldering agent required for soldering can be integrated into the stranded material and at the same time used as a soldering and sealing agent.
- 1 shows the cross section of a district heating pipe with an inner tube, outer tube and sensor
- Fig. 2 is a resistance measuring bridge with a tube and two sensor lines
- FIG. 2 shows an insulation measurement for FIG. 2
- Fig. 4 is a transit time measuring device with a tube and two sensor lines
- a piping system is shown with the cross section of a district heating line R, the inner tube 1, a
- Filling filling material 3 that is as dry as possible, e.g. one
- the sensor 4 is arranged in the filling material 3 and consists of a Cu-Ni alloy with an essentially constant and small temperature coefficient and a resistance value of about 0.15 ohm / m, which is a value that just allows the run time measurement and for the resistance measurement is sufficiently large.
- Fig. 2 shows a measuring method with location by a
- a voltage source 5 is connected between the start A of the sensor line 4 and the end E of the return wire 6, both of which are at the end 7 of the source remote
- a voltage measuring device 8 is connected between the start A of the sensor line 4 and the start of the inner tube 1. In the event of a leak F, a fault resistance RF between sensor line 4 and
- Inner tube 1 effective. So that the location of the fault resistor can be located precisely, the sensor cable must always be able to be contacted by the moisture, that is to say bare or provided with perforated insulation.
- the location of the fault can be determined from the resistance values Rl, R2 of the partial lines, the total resistance Rges of the sensor line 4.
- FIG. 3 shows how the insulation between inner tube 1 and sensor line 4 can be checked by switching the measuring device 8 differently. This does not require a return wire 6.
- the insulation resistance changes from, for example, 10 MOhm to 10 kOhm, and the voltage indicated by the measuring device 8 changes from 0 volt to 24 volt.
- a location is shown by a run time measurement. Between the beginning of the inner tube 1 and the beginning A a pulse generator 10 is connected to the sensor line 4.
- a sensor line 4 suitable for both measuring methods must therefore meet two contradictory requirements.
- a material is selected with which the requirement profile for the resistance location procedure on the one hand and the requirement profile of the running time procedure on the other hand are satisfactorily fulfilled.
- This is the case for a sensor conductor made of CuNi10.
- a conductor made of this alloy has a high-frequency resistance which is sufficiently low for the transit time measurement, in spite of a DC resistance which is higher than that of copper. This is important because in the two measuring methods a distinction must be made between the electrical direct current resistance RDC measured during the resistance location and the effective alternating current resistance RAC, which must be taken into account during the runtime location.
- the AC resistance RAC is only about one eighth of the corresponding value of a resistance wire.
- the resistance RAC is reduced to a value which is only slightly above the corresponding value of copper. At least one material can therefore be used which is suitable for the compatible use of the same sensor conductor for both measuring methods.
- the following table shows the for different materials Resistance values RDC and RAC, whereby on the one hand a solid conductor and on the other hand a strand 30 ⁇ 0.25 was used for the alloy CuNi10. The solid lines had a diameter of 1.5 mm2 for this measurement.
- the temperature coefficients are for
- the electrical resistance values for the individual conductors are:
- CuNi10 has a significantly lower specific resistance than the material NiCr8020 that has been customary for resistance location, this resistance is still sufficiently large against the undesired influence of connection points, supply lines and the like. Possibly. Undesired influences that still remain can be further reduced by appropriate selection of the cross sections.
- the temperature coefficient of CuNi10 is larger than that of NiCr ⁇ 020, but is still in the same order of magnitude.
- CuNi10 and alloys with similar electrical data in the form of solid wires or strands are suitable as sensor conductors for compatible use in both measuring methods.
- Sensors with stranded conductors should be soaked with a suitable material to achieve long-term water tightness.
- the material can be a solder that is required anyway.
- Insulation should be temperature resistant (e.g. PTFE).
- sensors can be provided with pores and / or closed conductive insulation (e.g. carbon doped).
- one type of conductor can be used for all types of measuring methods with sensor conductors.
- the measurement can be selected according to the respective degree of moisture of the possible error and the accuracy of the location can be improved. This also includes the use of both measuring methods for one fault location in order to minimize the costs of a possible repair. Damage is generally more expensive than the cost of the materials to be replaced.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95942658A EP0797759A1 (fr) | 1994-12-13 | 1995-11-28 | Systeme de conduites, en particulier pour le transport de chaleur dans le chauffage a distance |
AU43860/96A AU4386096A (en) | 1994-12-13 | 1995-11-28 | Pipeline system, in particular for conveying remote heat |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4444332.3 | 1994-12-13 | ||
DE4444332 | 1994-12-13 | ||
DE19501941.5 | 1995-01-24 | ||
DE19501941 | 1995-01-24 | ||
DE19505898 | 1995-02-21 | ||
DE19505898.4 | 1995-02-21 | ||
DE1995121018 DE19521018C2 (de) | 1995-06-12 | 1995-06-12 | Rohrleitungssystem, insbesondere für die Übertragung von Fernwärme |
DE19521018.2 | 1995-06-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996018874A1 true WO1996018874A1 (fr) | 1996-06-20 |
Family
ID=27436110
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1995/004616 WO1996018874A1 (fr) | 1994-12-13 | 1995-11-28 | Systeme de conduites, en particulier pour le transport de chaleur dans le chauffage a distance |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0797759A1 (fr) |
AU (1) | AU4386096A (fr) |
WO (1) | WO1996018874A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999041581A1 (fr) * | 1998-02-16 | 1999-08-19 | Inso Von Jeinsen | Dispositif pour la surveillance de tuyaux de conduite de fluides |
EP2112491A1 (fr) | 2008-04-26 | 2009-10-28 | JR-ISOTRONIC GmbH | Dispositif, système et procédé de détection et d'orientation d'inétanchéités |
CN106123109A (zh) * | 2016-08-05 | 2016-11-16 | 倪晨钧 | 一种管道监测系统 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0060552A2 (fr) * | 1981-03-16 | 1982-09-22 | G + H MONTAGE GmbH | Dispositif de contrôle d'un système de canalisation, en particulier canalisation isolée de chauffage à grande distance |
DE3626999A1 (de) * | 1986-08-08 | 1988-02-11 | Kabelmetal Electro Gmbh | Vorrichtung zur laufenden ueberwachung einer fernwaermeleitung |
EP0257575A1 (fr) * | 1986-08-21 | 1988-03-02 | Röro Gesellschaft für Isolier-und Fernheiztechnik mbH | Système de tuyauterie et tuyaux isolées thermiquement, par exemple pour tuyauteries du chauffage à distance |
DE4124640A1 (de) * | 1991-07-25 | 1993-01-28 | Bernd Brandes | Rohrleitungssystem |
-
1995
- 1995-11-28 EP EP95942658A patent/EP0797759A1/fr not_active Withdrawn
- 1995-11-28 AU AU43860/96A patent/AU4386096A/en not_active Abandoned
- 1995-11-28 WO PCT/EP1995/004616 patent/WO1996018874A1/fr not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0060552A2 (fr) * | 1981-03-16 | 1982-09-22 | G + H MONTAGE GmbH | Dispositif de contrôle d'un système de canalisation, en particulier canalisation isolée de chauffage à grande distance |
DE3626999A1 (de) * | 1986-08-08 | 1988-02-11 | Kabelmetal Electro Gmbh | Vorrichtung zur laufenden ueberwachung einer fernwaermeleitung |
EP0257575A1 (fr) * | 1986-08-21 | 1988-03-02 | Röro Gesellschaft für Isolier-und Fernheiztechnik mbH | Système de tuyauterie et tuyaux isolées thermiquement, par exemple pour tuyauteries du chauffage à distance |
DE4124640A1 (de) * | 1991-07-25 | 1993-01-28 | Bernd Brandes | Rohrleitungssystem |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999041581A1 (fr) * | 1998-02-16 | 1999-08-19 | Inso Von Jeinsen | Dispositif pour la surveillance de tuyaux de conduite de fluides |
EP2112491A1 (fr) | 2008-04-26 | 2009-10-28 | JR-ISOTRONIC GmbH | Dispositif, système et procédé de détection et d'orientation d'inétanchéités |
CN106123109A (zh) * | 2016-08-05 | 2016-11-16 | 倪晨钧 | 一种管道监测系统 |
CN106123109B (zh) * | 2016-08-05 | 2022-02-15 | 倪晨钧 | 一种管道监测系统 |
Also Published As
Publication number | Publication date |
---|---|
EP0797759A1 (fr) | 1997-10-01 |
AU4386096A (en) | 1996-07-03 |
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